Malicious PDF — malware analysis report

Static analysis result for SHA-256 3392c2c5765e143a…

MALICIOUS

PDF

83.1 KB Created: 2021-10-09 15:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5cc07f57c5c80dbee7dd125f23c7aa7c SHA-1: 007dbc312461c23233ba4bbb0dc4eec7e0e725d5 SHA-256: 3392c2c5765e143ac16f0ff00d791927a81f917b732cbcb32bbd6f46cedd7837
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting characteristics of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the exploitation of PDF viewers or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://smwiarus.pl/ckfinder/userfiles/files/96884843897.pdf In PDF document text
    • http://anpharma.net/upload/files/74397893808.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/79959874491.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/15255829763.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/kodovab.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/3853415622.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/gekanifop.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/benelokusadem.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/vituvumixajezimogut.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/zomupafegojatibosix.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021092018479_46461625.pdfIn PDF document text
    • https://tahsindincer.com/upload/ckfinder/files/fenemanu.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/jupafijibawuzenisox.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16136b70186bef---99711719724.pdfIn PDF document text
    • http://ropesadventure.com/d/files/jasoneta.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/39729194076.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wurunimizezodoravut.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/47190634852.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/kikakutogipufep.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/67824141063.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3859c0e9c731fabcf41c74ce049d350d/lomepegezanemimogogubi.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/70840631615.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/5224177358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=anonytun+for+ios+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 10496 bytes
SHA-256: 1f9290bc399adefc2225e5345a579b7e13f225a8131b69ce0bfd3cafade3412d
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 18020 bytes
SHA-256: 5fd812ee86280b6fd156bdac725e29df1962d9df83a55cf48796d08a0731c03e